Blow-off valve



A. G. HOLLINGSHEAD ETAL BLOW-OFF VALVE Fil'ed June 3. 1929 2 Sheets-Sheet 1 1932- A. a. HOLLINGSHEAD ETAL 2,

BLOW-OFF VALVE Filed June I5. 1929 2 Sheets-Sheet 2 AZZ' Patented ll,

unirso s'ra'rss ARTHUR G. HOLLINGSHEAD AND CURTIS W. PLGEN, OF CHICAGO, ILLZHOIS, ASSIGNOBS TO THE OKADEE GQMPANY, F CIIZCAGO, I3. TIN G13, 2%. CQR-IORATION OF ILLT INOIS Brow-Orr VALVE Application filed June 3, 1929. Serial No. 367,953.

This invention relates in general to valves, more particularly, to valves of the type in which the valve member is moved in an arc transversely across the valve seat by a member whose axis is parallel to and at one side of the central axis of the valve and such valves are commonly employed as blow-off valves on locomotives, although they may iind utility for other purposes.

The principal objects and advantages of our invention reside in the provision of an improved form of structure of straight-way valves; the provision of improved arrange ment of valve seat and outlet member ror such valves; the provision and means securing valvein position on a locomotive boiler; the provision ofimproved valve structure incorporating novel form of outlet member for directing the fluid issuing through the valve in the desired direction.

In blow-off valves as applied to locomotive boilers the outlet ofthe valve is usually arranged in a position so that the steam passing through the outlet blows straight out 25 from the locomotive, and it is another of the objects of this invention to provide in a unit structure an outlet member and meansifor securing the same to the valve casing arranged so as to deflect the structure offluid downwardly on the road bed so as not to interfere with the vision of the engineman or fireman, as the case may be, or to strike someone who may be standing by the track as the valve is opened, together with improved valve seat so that the device may be applied to existing valves without material modification of the structure thereof.

The foregoing and such other objects and advantages as may appear or be pointd out as this description proceeds are attained in the structure illustrated in the accompanying drawings in which.

Figure 1 is the end elevational view of the valve and outlet member of this invention.

Figure 2 is the longitudinal sectional view of the device of this invention taken on the line 22 of Figure 1 looking in the direction indicated by the arrows.

Figure 3 is a fragmentary sectional view taken on the line 33 of Figure 1 looking in the direction indicated by the arrows, and

Figure l is a perspective view of the outlet fitting.

Referring now more particularly to the drawings, we provide a valve casing 3 having a central passageway at for fluid, oneend of casing 3 being provided with a pair of lugs 5 suitably apertured to receive stud bolts 6 which are threaded into the side 7 of the locomotive boiler. Nuts 8 are provided on the bolts 6 for holding the casing in position. The outer end surface 9 of the casing 3'is ground to smooth surface and apacking cone or gasket 10 of a suitably metallic material, such as alloy of lead or babbitt, is inserted between the'surface line and the adjoining surface of .the boiler, the latter being countersunk as of 11 so as to receive the complemcntal surface of said gasket. The side of the boiler 7 is provided with aperture 13 which registers with the passage-way 4.

The outer end of the casing 3, that is the end remote from the boiler, is formed with a laterally extending eccentric portion 14 which is formed to provide a laterally .extending valve chamber15.

The valve chamber 15 is provided with an enlarged portion 16, in axial alignment with the passage-way 4, and said portion 14 is provided with external reenforcing ribs '17.

The casing extension ll containing the valve chamber 15 is adapted to receive a valve member comprising a yoke 18 having an annular extension 19 receiving the valvemem- 1 her 2-0. The valve member 20 is readily renewable and is retained in the yoke 18 by pressure of the fluid in the passage-way 4 for the reason that said valve engages valve seat member as will hereinafter appear.

The yoke 18 is mounted for angular dis placement upon an axis AA (see Figure To provide operating mechanism therefor we provide a threaded aperture 21 in an enlarged portion 22 of the valve chamber member 1a. The aperture 21 is substantially parallel to the axis of the passage-way 4. In the aperture 21 a bushing or hearing member 23 is threaded as shown at 24, and within said bushing we provide a revoluble shaft 25. This shaft 25 has an inner enlarged head 26 receivable in a suitable shaft opening in the yoke 18, and a flat portion 27 on said head serves to prevent relative rotation of the head and yoke, so that rotation of the shaft will impart oscillating movement to the yoke and valve member carried thereby back and forth across the axis of the passage-way 4.

Behind the head 27 we provide an annular flange 28 and the bushing 23 is recessed to receive a packing gasket 29 which prevents escape of the fluid along the shaft 25.

On the other end of the shaft we provide means for maintaining the flange 28 in snug abutment with the gasket 29. This means including a hub on a handle shown in dotted lines at 3042, Figure 1, having an enlarged portion 31 provided with an annular groove 32 for receiving one end of a helical spring 33, the bushing 23 being reduced so as to form a shoulder 34 against which the inner end of said spring abuts. The shaft 25 is provided with flattened portions 35 which prevent rotation of the handle with respect to the shaft and the outer end of the shaft is reduced and threaded as at 36 to receive a grip nut 37. By imparting movement to the handle 30a the shaft 25 may be rotated and thus the valve will move to and from its opened and closed positions.

When the valve is in open position it engages a wearing plate 38 inlaid in the adjacent wall of the valve chamber 15.

The valve seat is incorporated in a fitting generally designated as 39, said fitting having portions 40 and 41 at substantially right angles, and, therefore, forming anelbow, the passage-way 4 of said fitting being directed downwardly when the whole device is applied to a locomotive boiler.

The inner end of the portion 40 is provided with a ground valve seat 43 against which the valve member 20 engages when in closed position, the peripheral edge 44 of said valve seat being bevelled so as to facilitate movement of the valve from the wearing plate 38 to the valve seat.

The portion 40 of the fitting is provided with an annular shoulder 45, and a suitable packing 46 is interposed between said shoulder and outer face 47 of the adjacent end of the casing 3.

The portion 41 of the fitting 39 is enlarged as 47 and externally threaded as of 48 for connection to a hose line where it is desired to :wash out the boiler.

ing 46.

The lugs 49, it will be observed, are disposed in a plane diagonally with respect to the axis of the downwardly extending portion 41, this facilitating the drawing up of the fitting into place accurately. It is desirable that these lugs be so disposed in order to avoid complete re-design of the casing due to the position of the shaft 25, and hence the diagonal arrangement of the lugs.

Having thus described our invention and illustrated its use, what we claim as new and desire to secure by Letters Patent is 1. In a valve, a casing having an inlet and an outlet axially alined therewith, a valve member adapted to control flow of fluid through said casing and mounted so as to swing across said inlet, said casing having a laterally disposed portion for receiving the valve, a bearing member upon which said valve is adapted to swing, said bearing memher being disposed to one side of the axis of said inlet and outlet, a projecting part of said bearing member lying externally of said casing an outlet fitting having a portion projecting into the casing to form a valve seat and having an external laterally disposed elbow, said fittting having a pair of lugs thereon diametrically oppositely disposedon a transverse axis oblique with respect to said elbow so as to permit of securing said fitting to the casing with said lugs disposed so as to lie to one side of the externally projectin g part of said valve bearing member.

2. In a valve, a casing having an inlet and an aperture axially alined therewith, a valve receiving chamber disposed laterally of said inlet and aperture, a valve member in said chamber, a bearing member on which said valve member is swingable-across the axis of said. inlet and aperture, said bearing member being disposed laterally of saidaxis and having an operating portion projecting forwardly externally of said casing and operating in a plane transversely to said outlet aperture, an outlet fitting having an external elbow directed downwardly and aninternal reduced portion extending into said aperture and forming a valve seat for said valve member, and means for securing said fitting, comprising lugs disposed diametrically oppositely thereon, and in a plane obliquely to said downwardly projecting elbow so as to dispose one of said lugs'below the external operating part of said bearing member and thus he out of the path of and permit free movement of said operating part.

In testimony whereof we have hereunto signed our names.

ARTHUR G. HOLLINGSHEAD.

CURTIS l/V. PLOEN. 

